Red Hat Bugzilla – Bug 837297
DisplayPort hotplugging does not work
Last modified: 2013-08-04 02:52:40 EDT
Created attachment 595943 [details]
Xorg log file
Description of problem:
When DisplayPort monitor is switched off and then on again, it doesn't bring up the picture on the monitor, but shows "no-signal" and eventually goes to sleep.
Version-Release number of selected component (if applicable):
Linux localhost 3.4.3-1.fc17.x86_64 #1 SMP Mon Jun 18 19:53:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
Steps to Reproduce:
1. Boot into desktop.
2. Switch DP monitor off, then on
3. Monitor shows "no-signal" and goes to sleep.
Blank screen, no signal, monitor goes to sleep.
Picture after swtich on, what else.
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 5870 (Cypress) (prog-if 00 [VGA controller])
Subsystem: Giga-byte Technology Device 21e5
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at b0120000 (64-bit, non-prefetchable) [size=128K]
I/O ports at 2000 [size=256]
Expansion ROM at b0100000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
[ 6.180] (II) RADEON(0): EDID for output DisplayPort-0
[ 6.180] (II) RADEON(0): Manufacturer: HWP Model: 2869 Serial#: 16843009
[ 6.180] (II) RADEON(0): Year: 2010 Week: 32
[ 6.180] (II) RADEON(0): EDID Version: 1.4
[ 6.180] (II) RADEON(0): Digital Display Input
[ 6.180] (II) RADEON(0): 8 bits per channel
[ 6.180] (II) RADEON(0): Digital interface is DisplayPort
[ 6.180] (II) RADEON(0): Max Image Size [cm]: horiz.: 54 vert.: 35
[ 6.180] (II) RADEON(0): Gamma: 2.20
[ 6.180] (II) RADEON(0): DPMS capabilities: Off
[ 6.180] (II) RADEON(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4
[ 6.180] (II) RADEON(0): Default color space is primary color space
What is the mark, brand and reference of the screen ?
(In reply to comment #1)
> What is the mark, brand and reference of the screen ?
It is Hewlett-Packard HP ZR24w.
I am also getting the same results using a Radeon HD 3650 card and a Emerson brand screen ( i don't know much about this display unfortunately)
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Just FYI, the problem is fixed in Fedora 19. I can switch the DisplayPort attached monitor off and back on, and it displays correct picture without problems.