https://bugs.freedesktop.org/show_bug.cgi?id=86861
Bug ID: 86861
Summary: [rv6xx] When using a hardware KVM switch between
computers EDID sometimes not detected/display goes
fuzzy
Product: DRI
Version: XOrg git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Radeon
Assignee: dri-devel at lists.freedesktop.org
Reporter: shawn.starr at rogers.com
kernel: 3.17.2-300.fc21.x86_6
I've noticed sometimes when using my KVM Switch when switching to the laptop. I
get fuzzy text in console w/ KMS on.
if I start X, the fuzzy display continues, a full reboot resets the display
properly.
Caught an error this time (maybe just as it was about to detect the EDID of
display)
[ 5877.852952] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 130
[ 5877.860547] Raw EDID:
[ 5877.862264] 00 ff ff ff ff ff ff 00 ff ff ff ff ff ff ff ff
[ 5877.865817] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 5877.867201] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 5877.870127] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 5877.871706] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 5877.874040] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 5877.875309] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 5877.876593] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 5877.880376] [drm:radeon_vga_detect] *ERROR* VGA-1: probed a monitor but
no|invalid EDID
KVM switch model: ATEN CS-1734A (Firmware: V4.2.417 not upgraded since
purchase)
The actual EDID of the display (from Xorg log):
[ 416.432] (II) RADEON(0): EDID (in hex):
[ 416.432] (II) RADEON(0): 00ffffffffffff00320c00f200000000
[ 416.432] (II) RADEON(0): 0011010380211578eaba709859528c28
[ 416.432] (II) RADEON(0): 2550542108008180a940010101010101
[ 416.432] (II) RADEON(0): 010101010101e33a805a70b032401e1e
[ 416.432] (II) RADEON(0): 13004bcf100000190000000000000000
[ 416.432] (II) RADEON(0): 00000000000000000000000000fe0058
[ 416.432] (II) RADEON(0): 55333031043135345755310a000000fe
[ 416.432] (II) RADEON(0): 00283e4c53739bbaff02010a202000aa
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