1edid-decode(1) General Commands Manual edid-decode(1)
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6 edid-decode - Decode EDID data in human-readable format
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9 edid-decode <options> [in [out]]
10
12 edid-decode decodes EDID monitor description data in human-readable
13 format. If [in] is not given, or [in] is '-', then the EDID will be
14 read from standard input. If [out] is given then the EDID that was read
15 from [in] is written to [out] or to standard output if [out] is '-'. By
16 default the output is written as a hex dump when writing to standard
17 output or a raw EDID if written to a file.
18 If [out] is given then edid-decode only does the conversion, it will
20 skip the decoding step.
21 Input files may be raw binaries or ASCII text. ASCII input is scanned
23 for hex dumps; heuristics are included to search for hexdumps in edid-
24 decode(1) output (as long as the initial hex dump was included),
25 xrandr(1) property output and Xorg(1) log file formats, otherwise the
26 data is treated as a raw hexdump. EDID blocks for connected monitors
27 can be found in /sys/class/drm/*/edid on modern Linux systems with ker‐
28 nel modesetting support.
29 All timings are shown in a short format, for example:
31 VIC 16: 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz
33 (native)
34 VIC 5: 1920x1080i 60.000 Hz 16:9 33.750 kHz 74.250 MHz
35 VIC 39: 1920x1080i 50.000 Hz 16:9 31.250 kHz 72.000 MHz
36 Each format starts with a timings type prefix, the resolution, an op‐
38 tional interlaced indicator ('i'), the frame rate (field rate for in‐
39 terlaced formats), the picture aspect ratio, the horizontal frequency,
40 the pixelclock frequency and optionally additional flags between paren‐
41 thesis.
42 Note that for interlaced formats the frame height is given, not the
44 field height. So each field in a 1920x1080i format has 540 lines.
45 Detailed timings have another 2-3 lines of data:
47 VIC 16: 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz
49 (native)
50 Hfront 88 Hsync 44 Hback 148 Hpol P
51 Vfront 4 Vsync 5 Vback 36 Vpol P
52 VIC 5: 1920x1080i 60.000 Hz 16:9 33.750 kHz 74.250 MHz
53 Hfront 88 Hsync 44 Hback 148 Hpol P
54 Vfront 2 Vsync 5 Vback 15 Vpol P Vfront +0.5
55 Odd Field
56 Vfront 2 Vsync 5 Vback 15 Vpol P Vback +0.5
57 Even Field
58 VIC 39: 1920x1080i 50.000 Hz 16:9 31.250 kHz 72.000 MHz
59 Hfront 32 Hsync 168 Hback 184 Hpol P
60 Vfront 23 Vsync 5 Vback 57 Vpol N Both Fields
61 These describe the horizontal and vertical front porch, sync, backporch
63 and sync polarity values. For interlaced formats there are two lines
64 for the vertical information: one for the Odd Field (aka Field 1) and
65 one for the Even Field (aka Field 2). The vertical front porch of the
66 Odd Field is actually 2.5 (hence the 'Vfront +0.5' at the end of the
67 line), and the back porch of the Even Field is actually 15.5 (hence the
68 'Vback +0.5' at the end of the line).
69 There is a special 'VIC 39' interlaced format where both fields have
71 the same vertical timings, in that case this is marked with 'Both
72 Fields'.
73 The following timing types can be shown:
75 DMT #: Discrete Monitor Timing (see DMT 1.3 standard). The num‐
78 ber is the DMT ID in hexadecimal.
79 CVT: Coordinated Video Timings (formula-based, see CVT 1.2 stan‐
81 dard)
82 GTF: Generalized Timing Formula (formula-based, see GTF 1.1
84 standard)
85 IBM: Old IBM Timings
87 Apple: Old Apple Timings
89 VIC #: Video Identification Code (see CTA-861 standard). The
91 number is the actual
92 VIC code.
93 HDMI VIC #: HDMI-specific Video Identification Code (see HDMI
95 2.1 standard). The number
96 is the actual HDMI VIC code.
97 DTD #: Detailed Timings Descriptor (see EDID standard). Also
99 used for
100 DisplayID Video Timing Modes Types I, II, VI, VII, VIII
101 and X. The number denotes that this is the Nth DTD in the
102 Base Block and CTA Extension Blocks.
103 VTDB #: 20-byte DTD or 6- or 7-byte CVT descriptor in a CTA Ex‐
105 tension Block.
106 The number denotes that this is the Nth such timing in
107 the CTA Extension Blocks.
108 RID #@#: A CTA-861.6 Video Format Descriptor with the given Res‐
110 olution ID (first
111 number) at the given framerate (second number).
112 By default DTDs are shown in the long format while others are just
114 shown in the short format. With the option --short-timings all timings
115 are shown in short format only. With the option --long-timings all tim‐
116 ings are shown in long format.
117 Alternate formats for long timings can be chosen via the --xmodeline or
119 --fbmode options.
120
123 The following EDID standards are supported by edid-decode:
124 EDID 1.3: VESA Enhanced Extended Display Identication Data Stan‐
126 dard, Release A, Revision 1
127 EDID 1.4: VESA Enhanced Extended Display Identication Data Stan‐
129 dard, Release A, Revision 2
130 DisplayID 1.3: VESA Display Identification Data (DisplayID)
132 Standard, Version 1.3
133 DisplayID 2.1: VESA DisplayID Standard, Version 2.1
135 DI-EXT: VESA Display Information Extension Block Standard, Re‐
137 lease A
138 LS-EXT: VESA Enhanced EDID Localized String Extension Standard,
140 Release A
141 VTB-EXT: VESA Video Timing Block Extension Data Standard, Re‐
143 lease A
144 DTCDB: VESA Display Transfer Characteristics Data Block Stan‐
146 dard, Version 1.0
147 DDDB: VESA Display Device Data Block (DDDB) Standard, Version 1
149 HDMI 1.4b: High-Definition Multimedia Interface, Version 1.4b
151 HDMI 2.1: High-Definition Multimedia Interface, Version 2.1
153 HDMI 2.1: Amendment A1 to HDMI Specification Version 2.1
155 CTA-861-I: A DTV Profile for Uncompressed High Speed Digital In‐
157 terfaces
158 SPWG Notebook Panel Specification, Version 3.5
160 EPI Embedded Panel Interface, Revision 1.0
162 Microsoft EDID extension for head-mounted and specialized moni‐
164 tors, Version 3
165 The following related standards are also used by edid-decode:
168 DMT 1.3: VESA and Industry Standards and Guidelines for Computer
170 Display Monitor Timing (DMT), Version 1.0, Rev. 13
171 CVT 2.0: VESA Coordinated Video Timings (CVT) Standard, Version
173 2.0
174 CVT 1.2: VESA Coordinated Video Timings (CVT) Standard, Version
176 1.2
177 CVT 1.2: VESA CVT v1.2 Errata E2
179 GTF 1.1: VESA Generalized Timing Formula Standard, Version: 1.1
181
184 -h, --help
185 Prints the help message.
186 -o, --output-format <fmt>
188 If [out] is specified, then write the EDID in format <fmt>.
189 The output format can be one of:
191 hex: hex numbers in ascii text (default for stdout)
192 raw: binary data (default unless writing to stdout)
193 carray: c-program struct
194 xml: XML data
195 -c, --check
197 Check if the EDID conforms to the standards. Warnings and fail‐
198 ures are reported at the end.
199 -C, --check-inline
201 Check if the EDID conforms to the standards. Warnings and fail‐
202 ures are reported as they happen.
203 -n, --native-resolution
205 Report the native resolution at the end. There may be multiple
206 native resolution reports depending on whether the Source only
207 parses Block 0 (e.g. DVI outputs) or Block 0 and the CTA-861 Ex‐
208 tension Blocks (HDMI), or just the DisplayID Extension Blocks
209 (typical for DisplayPort). If all blocks contain the same native
210 resolution, then only that resolution is reported. For older
211 displays there may be two separate native resolutions: progres‐
212 sive and interlaced.
213 -p, --preferred-timings
215 Report the preferred timings at the end. There may be multiple
216 preferred timing reports depending on whether the Source only
217 parses Block 0 (e.g. DVI outputs), or Block 0 and the CTA-861
218 Extension Blocks (HDMI), or Block 0 and the DisplayID Extension
219 Blocks (typical for DisplayPort).
220 --diagonal <inches>
222 Specify the diagonal of the display in inches. This will enable
223 additional checks for the image size, checking if it corresponds
224 to the diagonal. This assumes square pixels.
225 -P, --physical-address
227 Just report the HDMI Source Physical Address and nothing else.
228 Reports f.f.f.f if the EDID could not be parsed, or if there was
229 no CTA-861 Vendor-Specific Data Block with OUI 00-0C-03. Other‐
230 wise it reports the Source Physical Address as provided in that
231 Data Block. This can be used as input to HDMI CEC utilities such
232 as the linux cec-ctl(1) utility.
233 -S, --short-timings
235 Report all video timings in a short format.
236 -L, --long-timings
238 Report all video timings in a long format.
239 -N, --ntsc
241 Report the video timings with values suitable for NTSC-based
242 video. E.g., this will show refresh rates of 29.97 Hz instead
243 of 30 Hz. This is only done for timings with refresh rates that
244 are a multiple of 6.
245 -X, --xmodeline
247 Report all long video timings in the ModeLine format as defined
248 in xorg.conf(5). This ModeLine can be used in the xorg.conf
249 file or passed to xrandr(1) with the xrandr --newmode option.
250 -F, --fbmode
252 Report all long video timings in the video mode format as de‐
253 fined in fb.modes(5).
254 -V, --v4l2-timings
256 Report all long video timings in the video mode format as de‐
257 fined in the linux header v4l2-dv-timings.h for use with the
258 V4L2 VIDIOC_S_DV_TIMINGS ioctl.
259 -s, --skip-hex-dump
261 Skip the initial hex dump of the EDID.
262 -H, --only-hex-dump
264 Only show the hex dump of the EDID, then exit.
265 --skip-sha
267 Don't show the SHA hash. Normally edid-decode will show the SHA,
268 i.e. the hash of the git commit used to compile edid-decode.
269 This uniquely identifies the version of edid-decode that is used
270 to generate the warnings and failures. But it will also change
271 the output of edid-decode for every new commit in the git repos‐
272 itory, even if nothing else changed in the edid-decode output.
273 Use this option to avoid including the SHA in the edid-decode
274 output.
275 --hide-serial-numbers
277 Hide any serial numbers in the human readable output by '...'.
278 Note that they are still easily extracted from the EDID hex dump
279 at the start.
280 --replace-unique-ids
282 Replaces any unique IDs in the EDID by fixed values. Serial num‐
283 bers will be replaced by '123456' and Container IDs by all ze‐
284 roes. This will also update any checksums in the EDID and update
285 the EDID hex dump at the start of the output. Note that since
286 this will update checksums, any checksum errors present in the
287 original EDID will no longer be detected.
288 Serial numbers can appear in the Base Block, DisplayID Extension
290 Blocks and Localized String Extension Blocks. Container IDs can
291 appear in the DisplayID and CTA-861 Extension Blocks.
292 --version
294 Show the SHA hash and the last commit date.
295
298 The following options report the timings for DMT, VIC and HDMI VIC
299 codes and calculate the timings for CVT or GTF timings, based on the
300 given parameters. The EDID will not be shown, although it can be used
301 with the --gtf option in order to read the secondary curve parameters.
302 --std <byte1>,<byte2>
304 Show the standard timing represented by these two bytes.
305 --dmt <dmt>
307 Show the timings for the DMT with the given DMT ID.
308 --vic <vic>
310 Show the timings for this VIC.
311 --hdmi-vic <hdmivic>
313 Show the timings for this HDMI VIC.
314 --cvt w=<width>,h=<height>,fps=<fps>[,rb=<rb>][,interlaced][,overscan]
316 [,alt][,hblank=<hblank>][,vblank=<vblank>][,early-vsync]
317 Calculate the CVT timings for the given format.
318 <width> is the width in pixels, <height> is the frame (not
320 field!) height in lines.
321 <fps> is frames per second for progressive timings and fields
322 per second for interlaced timings.
323 <rb> can be 0 (no reduced blanking, default), or 1-3 for the re‐
324 duced blanking version.
325 If interlaced is given, then this is an interlaced format.
326 If overscan is given, then this is an overscanned format. I.e.,
327 margins are required.
328 If alt is given and <rb>=2, then report the timings optimized
329 for video: 1000 / 1001 * <fps>.
330 If alt is given and <rb>=3, then the horizontal blanking is 160
331 instead of 80 pixels.
332 If hblank is given and <rb>=3, then the horizontal blanking is
333 <hblank> pixels (range of 80-200 and divisible by 8), overriding
334 alt.
335 If vblank is given and <rb>=3, then the vertical blanking time
336 is <vblank> microseconds (460 minimum, values > 705 might not be
337 supported by all RBv3 timings compliant source devices.
338 If early-vsync is given and <rb>=3, then select an early vsync
339 timing.
340 --gtf w=<width>,h=<height>[,fps=<fps>][,horfreq=<horfreq>][,pix‐
342 clk=<pixclk>]
343 [,interlaced][,overscan][,sec‐
344 ondary][,C=<c>][,M=<m>][,K=<k>][,J=<j>]
345 Calculate the GTF timings for the given format.
346 <width> is the width in pixels, <height> is the frame (not
348 field!) height in lines.
349 <fps> is frames per second for progressive timings and fields
350 per second for interlaced timings.
351 <horfreq> is the horizontal frequency in kHz.
352 <pixclk> is the pixel clock frequency in MHz. Only one of fps,
353 horfreq or pixclk must be given.
354 If interlaced is given, then this is an interlaced format.
355 If overscan is given, then this is an overscanned format. I.e.,
356 margins are required.
357 If secondary is given, then the secondary GTF is used for re‐
358 duced blanking, where <c>, <m>, <k> and <j> are parameters for
359 the secondary curve. If none of the secondary curve parameters
360 were set, and an EDID file is passed as command line option,
361 then the secondary curve parameters are read from that EDID.
362 The default secondary curve parameters are 40 for <c>, 600 for
363 <m>, 128 for <k> and 20 for <j>. These values correspond to the
364 normal curve that GTF uses.
365 --ovt (rid=<rid>|w=<width>,h=<height>),fps=<fps>
367 Calculate the OVT timings for the given format. Either specify
368 a <rid> or specify <width> and <height>. <fps> is frames per
369 second.
370 --list-established-timings
372 List all known Established Timings.
373 --list-dmts
375 List all known DMTs.
376 --list-vics
378 List all known VICs.
379 --list-hdmi-vics
381 List all known HDMI VICs.
382 --list-rids
384 List all known CTA-861 RIDs.
385 --list-rid-timings <rid>
387 List all timings for the specified <rid> or all known RIDs if
388 <rid> is 0.
389
392 Not all fields are decoded, or decoded completely. edid-decode does
393 attempt to validate its input against the relevant standards, but its
394 opinions have not been double-checked with the relevant standards bod‐
395 ies, so they may be wrong. Do not rely on the output format, as it
396 will likely change in future versions of the tool as additional fields
397 and extensions are added.
398
400 Xorg(1), xrandr(1), cec-ctl(1), xorg.conf(5), fb.modes(5)
401
403 edid-decode was written by Adam Jackson, with contributions from Eric
404 Anholt, Damien Lespiau, Hans Verkuil and others. For complete history
405 and the latest version, see http://git.linuxtv.org/cgit.cgi/edid-de‐
406 code.git
407 edid-decode(1)