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 and VII. The
101 number denotes that this is the Nth DTD in the EDID.
102 By default DTDs are shown in the long format while others are just
104 shown in the short format. With the option --short-timings all timings
105 are shown in short format only. With the option --long-timings all tim‐
106 ings are shown in long format.
107 Alternate formats for long timings can be chosen via the --xmodeline or
109 --fbmode options.
110
113 The following EDID standards are supported by edid-decode:
114 EDID 1.3: VESA Enhanced Extended Display Identication Data Stan‐
116 dard, Release A, Revision 1
117 EDID 1.4: VESA Enhanced Extended Display Identication Data Stan‐
119 dard, Release A, Revision 2
120 DisplayID 1.3: VESA Display Identification Data (DisplayID)
122 Standard, Version 1.3
123 DisplayID 2.0: VESA DisplayID Standard, Version 2.0
125 DisplayID 2.0: VESA DisplayID v2.0 Errata E9
127 DI-EXT: VESA Display Information Extension Block Standard, Re‐
129 lease A
130 LS-EXT: VESA Enhanced EDID Localized String Extension Standard,
132 Release A
133 VTB-EXT: VESA Video Timing Block Extension Data Standard, Re‐
135 lease A
136 DTCDB: VESA Display Transfer Characteristics Data Block Stan‐
138 dard, Version 1.0
139 DDDB: VESA Display Device Data Block (DDDB) Standard, Version 1
141 HDMI 1.4b: High-Definition Multimedia Interface, Version 1.4b
143 HDMI 2.1: High-Definition Multimedia Interface, Version 2.1
145 HDMI 2.1: Amendment A1 to HDMI Specification Version 2.1
147 CTA-861-H: A DTV Profile for Uncompressed High Speed Digital In‐
149 terfaces
150 SPWG Notebook Panel Specification, Version 3.5
152 EPI Embedded Panel Interface, Revision 1.0
154 Microsoft EDID extension for head-mounted and specialized moni‐
156 tors, Version 3
157 The following related standards are also used by edid-decode:
160 DMT 1.3: VESA and Industry Standards and Guidelines for Computer
162 Display Monitor Timing (DMT), Version 1.0, Rev. 13
163 CVT 2.0: VESA Coordinated Video Timings (CVT) Standard, Version
165 2.0
166 CVT 1.2: VESA Coordinated Video Timings (CVT) Standard, Version
168 1.2
169 CVT 1.2: VESA CVT v1.2 Errata E2
171 GTF 1.1: VESA Generalized Timing Formula Standard, Version: 1.1
173
176 -h, --help
177 Prints the help message.
178 -o, --output-format <fmt>
180 If [out] is specified, then write the EDID in format <fmt>.
181 The output format can be one of:
183 hex: hex numbers in ascii text (default for stdout)
184 raw: binary data (default unless writing to stdout)
185 carray: c-program struct
186 xml: XML data
187 -c, --check
189 Check if the EDID conforms to the standards. Warnings and fail‐
190 ures are reported at the end.
191 -C, --check-inline
193 Check if the EDID conforms to the standards. Warnings and fail‐
194 ures are reported as they happen.
195 -n, --native-resolution
197 Report the native resolution at the end. There may be multiple
198 native resolution reports depending on whether the Source only
199 parses Block 0 (e.g. DVI outputs) or Block 0 and the CTA-861 Ex‐
200 tension Blocks (HDMI), or just the DisplayID Extension Blocks
201 (typical for DisplayPort). If all blocks contain the same native
202 resolution, then only that resolution is reported. For older
203 displays there may be two separate native resolutions: progres‐
204 sive and interlaced.
205 -p, --preferred-timings
207 Report the preferred timings at the end. There may be multiple
208 preferred timing reports depending on whether the Source only
209 parses Block 0 (e.g. DVI outputs), or Block 0 and the CTA-861
210 Extension Blocks (HDMI), or Block 0 and the DisplayID Extension
211 Blocks (typical for DisplayPort).
212 -P, --physical-address
214 Just report the HDMI Source Physical Address and nothing else.
215 Reports f.f.f.f if the EDID could not be parsed, or if there was
216 no CTA-861 Vendor-Specific Data Block with OUI 00-0C-03. Other‐
217 wise it reports the Source Physical Address as provided in that
218 Data Block. This can be used as input to HDMI CEC utilities such
219 as the linux cec-ctl(1) utility.
220 -S, --short-timings
222 Report all video timings in a short format.
223 -L, --long-timings
225 Report all video timings in a long format.
226 -N, --ntsc
228 Report the video timings with values suitable for NTSC-based
229 video. E.g., this will show refresh rates of 29.97 Hz instead
230 of 30 Hz. This is only done for timings with refresh rates that
231 are a multiple of 6.
232 -X, --xmodeline
234 Report all long video timings in the ModeLine format as defined
235 in xorg.conf(5). This ModeLine can be used in the xorg.conf
236 file or passed to xrandr(1) with the xrandr --newmode option.
237 -F, --fbmode
239 Report all long video timings in the video mode format as de‐
240 fined in fb.modes(5).
241 -V, --v4l2-timings
243 Report all long video timings in the video mode format as de‐
244 fined in the linux header v4l2-dv-timings.h for use with the
245 V4L2 VIDIOC_S_DV_TIMINGS ioctl.
246 -s, --skip-hex-dump
248 Skip the initial hex dump of the EDID.
249 -H, --only-hex-dump
251 Only show the hex dump of the EDID, then exit.
252 --skip-sha
254 Don't show the SHA hash. Normally edid-decode will show the SHA,
255 i.e. the hash of the git commit used to compile edid-decode.
256 This uniquely identifies the version of edid-decode that is used
257 to generate the warnings and failures. But it will also change
258 the output of edid-decode for every new commit in the git repos‐
259 itory, even if nothing else changed in the edid-decode output.
260 Use this option to avoid including the SHA in the edid-decode
261 output.
262 --hide-serial-numbers
264 Replace any serial numbers in the human readable output by
265 '...'. Note that they are still easily extracted from the EDID
266 hex dump at the start.
267 --version
269 Show the SHA hash and the last commit date.
270
273 The following options report the timings for DMT, VIC and HDMI VIC
274 codes and calculate the timings for CVT or GTF timings, based on the
275 given parameters. The EDID will not be shown, although it can be used
276 with the --gtf option in order to read the secondary curve parameters.
277 --std <byte1>,<byte2>
279 Show the standard timing represented by these two bytes.
280 --dmt <dmt>
282 Show the timings for the DMT with the given DMT ID.
283 --vic <vic>
285 Show the timings for this VIC.
286 --hdmi-vic <hdmivic>
288 Show the timings for this HDMI VIC.
289 --cvt w=<width>,h=<height>,fps=<fps>[,rb=<rb>][,interlaced][,overscan]
291 [,alt][,hblank=<hblank>][,vblank=<vblank>][,early-vsync]
292 Calculate the CVT timings for the given format.
293 <width> is the width in pixels, <height> is the frame (not
295 field!) height in lines.
296 <fps> is frames per second for progressive timings and fields
297 per second for interlaced timings.
298 <rb> can be 0 (no reduced blanking, default), or 1-3 for the re‐
299 duced blanking version.
300 If interlaced is given, then this is an interlaced format.
301 If overscan is given, then this is an overscanned format. I.e.,
302 margins are required.
303 If alt is given and <rb>=2, then report the timings optimized
304 for video: 1000 / 1001 * <fps>.
305 If alt is given and <rb>=3, then the horizontal blanking is 160
306 instead of 80 pixels.
307 If hblank is given and <rb>=3, then the horizontal blanking is
308 <hblank> pixels (range of 80-200 and divisible by 8), overriding
309 alt.
310 If vblank is given and <rb>=3, then the vertical blanking time
311 is <vblank> microseconds (460 minimum, values > 705 might not be
312 supported by all RBv3 timings compliant source devices.
313 If early-vsync is given and <rb>=3, then select an early vsync
314 timing.
315 --gtf w=<width>,h=<height>[,fps=<fps>][,horfreq=<horfreq>][,pix‐
317 clk=<pixclk>]
318 [,interlaced][,overscan][,sec‐
319 ondary][,C=<c>][,M=<m>][,K=<k>][,J=<j>]
320 Calculate the GTF timings for the given format.
321 <width> is the width in pixels, <height> is the frame (not
323 field!) height in lines.
324 <fps> is frames per second for progressive timings and fields
325 per second for interlaced timings.
326 <horfreq> is the horizontal frequency in kHz.
327 <pixclk> is the pixel clock frequency in MHz. Only one of fps,
328 horfreq or pixclk must be given.
329 If interlaced is given, then this is an interlaced format.
330 If overscan is given, then this is an overscanned format. I.e.,
331 margins are required.
332 If secondary is given, then the secondary GTF is used for re‐
333 duced blanking, where <c>, <m>, <k> and <j> are parameters for
334 the secondary curve. If none of the secondary curve parameters
335 were set, and an EDID file is passed as command line option,
336 then the secondary curve parameters are read from that EDID.
337 The default secondary curve parameters are 40 for <c>, 600 for
338 <m>, 128 for <k> and 20 for <j>. These values correspond to the
339 normal curve that GTF uses.
340 --list-established-timings
342 List all known Established Timings.
343 --list-dmts
345 List all known DMTs.
346 --list-vics
348 List all known VICs.
349 --list-hdmi-vics
351 List all known HDMI VICs.
352
355 Not all fields are decoded, or decoded completely. edid-decode does
356 attempt to validate its input against the relevant standards, but its
357 opinions have not been double-checked with the relevant standards bod‐
358 ies, so they may be wrong. Do not rely on the output format, as it
359 will likely change in future versions of the tool as additional fields
360 and extensions are added.
361
363 Xorg(1), xrandr(1), cec-ctl(1), xorg.conf(5), fb.modes(5)
364
366 edid-decode was written by Adam Jackson, with contributions from Eric
367 Anholt, Damien Lespiau, Hans Verkuil and others. For complete history
368 and the latest version, see http://git.linuxtv.org/cgit.cgi/edid-de‐
369 code.git
370 edid-decode(1)