* [Bug 97730] Monitor not recognized after upgrading to a Radeon RX 480
@ 2016-09-09 17:20 bugzilla-daemon
2016-09-10 6:50 ` bugzilla-daemon
2019-11-19 8:10 ` bugzilla-daemon
0 siblings, 2 replies; 3+ messages in thread
From: bugzilla-daemon @ 2016-09-09 17:20 UTC (permalink / raw)
To: dri-devel
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https://bugs.freedesktop.org/show_bug.cgi?id=97730
Bug ID: 97730
Summary: Monitor not recognized after upgrading to a Radeon RX
480
Product: DRI
Version: DRI git
Hardware: Other
OS: All
Status: NEW
Severity: major
Priority: medium
Component: DRM/AMDgpu
Assignee: dri-devel@lists.freedesktop.org
Reporter: damien@grassart.com
Created attachment 126413
--> https://bugs.freedesktop.org/attachment.cgi?id=126413&action=edit
/sys/class/drm/card0-DP-2/edid
I upgraded my video card from a Radeon HD 8770 to a Radeon RX 480 after which
my monitor stopped working. I believe it is an EDID problem since dmesg
contains this repeated 4 times:
[ +0.120622] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is
invalid, remainder is 128
[ +0.000011] Raw EDID:
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000004] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000004] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000004] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
As well as:
[ +0.000005] amdgpu 0000:01:00.0: DP-2: Ignoring invalid EDID block 1.
[ +0.149608] amdgpu 0000:01:00.0: No connectors reported connected with modes
xrandr shows this error message when I run it: "xrandr: Output DisplayPort-1 is
not disconnected but has no modes".
I can actually get the monitor working by manually adding a mode:
$ cvt 2560 1440
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493
-hsync +vsync
$ xrandr --newmode "2560x1440" 312.25 2560 2752 3024 3488 1440 1443 1448 1493
-hsync +vsync
$ xrandr --addmode DisplayPort-1 2560x1440
I've attached the /sys/class/drm/card0-DP-2/edid file if that is helpful.
Please let me know if I can provide anything else.
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