Created attachment 95484 [details] xorg.log Hi Sometimes when wake my monitor from standby weird 'pixel static'(?) appears on the screen. By this I mean some pixels are not colored the way they are supposed to. The 'static' also isn't stable and it seems to jitter about similar to analog tv static. I could try continuing to describe it, but that would probably only lead to more confusion. To compensate, I've attached a few photos of what I'm seeing. Here are a few things that I gather to be known of this problem: * The static is triggered when the monitor comes out of standby, but is not guaranteed to happen everytime the monitor is woken up * The static does NOT appear in screenshots * turning the monitor off/on via power switch does NOT fix * turning the monitor off/on via xrandr DOES fix Hardware specific details: * graphics card is radeon hd 4850 (rv770) * running dual monitors, both Asus VS248H-P LED-backlit * static is only ever present on DVI-0
Created attachment 95485 [details] static on top of desktop background
Created attachment 95486 [details] static on top of terminal note the regular pattern
Created attachment 95487 [details] static on top of terminal with cursor
Created attachment 95488 [details] static on top of terminal, full screen
Created attachment 95489 [details] static on top of terminal with mouse cursor
(In reply to comment #0) Given that the static doesn't appear in screenshots and the fact that it's only present on DVI-0, I am a bit skeptical that this might indeed be a hardware problem, but I wanted to hear an expert's thoughts on this problem before I discount software entirely.
Please attach your dmesg output. It's possible that it's a software issue, possibly a timing issue with respect to initializing part of the display pipe. E.g., you need a 10 us delay between turning on blocks A and B for block a to synchronize, but in certain causes you only get 9 us or in certain causes you really need 11 us, etc.
Created attachment 95517 [details] dmesg Here is my dmesg as requested. From what I can tell, it is all boot messages though. Nothing in particular is output when the static occurs.
Is it still an issue if you disable dpm? E.g., boot with radeon.dpm=0 on the kernel command line in grub?
I haven't tried disabling dpm on 3.13 yet, but I do know this has occurred from time-to-time before dpm was enabled by default in 3.13 (The first occurance would probably be a year or more ago) so I don't know if that changes anything... I will try disabling dpm though, but the problem with reproducing this bug is that it doesn't happen with full probability when coming out of standby. Is there some way to force standby state without waiting for the system to timeout?
(In reply to comment #10) > I haven't tried disabling dpm on 3.13 yet, but I do know this has occurred > from time-to-time before dpm was enabled by default in 3.13 (The first > occurance would probably be a year or more ago) so I don't know if that > changes anything... Ok. If you saw it without dpm, then it's probably not related. > > I will try disabling dpm though, but the problem with reproducing this bug > is that it doesn't happen with full probability when coming out of standby. > Is there some way to force standby state without waiting for the system to > timeout? Try running: sleep 5; xset dpms force off from a terminal
Some time ago, I replaced the old 4850 with a newer Tonga card and haven't seen this problem since. As a result, I'm going to claim the source of this issue had been problems that were the result of aging hardware. Marking RESOLVED - INVALID
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