[Bug 86861] [rv6xx] When using a hardware KVM switch between computers EDID sometimes not detected/display goes fuzzy

[bugzilla-daemon at freedesktop.org]

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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