[Bug 90099] New: One pixel high lines appearing all over the place on RS780

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90099

            Bug ID: 90099
           Summary: One pixel high lines appearing all over the place on
                    RS780
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: doctorjellyface at riseup.net
        QA Contact: xorg-team at lists.x.org

I have an ATI Mobility Radeon 3200 on my HP Compaq 6735s.

Important: this bug is a regression. It used to work flawlessly. I don't know
what's causing the bug or when specifically it started, but I know that Ubuntu
14.04 hasn't got this bug, but 14.10 has. Now running Arch Linux, and it's
still there.

I am unable record the bug or capture it on a screenshot, so I'll try to
describe it.

I have these thin, usually white lines appearing all over the place, with their
length ranging from a couple to a couple hundred pixels. Always horizontal.
They disappear quickly too, so sometimes I'm not even sure what colour they
are.

The weirdest thing is that they only appear when the system is cold (e.g. on
cold boot), so they're the most in the boot screen and the login screen.
Happens in a TTY, in X and in Wayland. The hotter the system gets, the shorter
they are. I don't usually see them at all, but when you stare at the display,
you sense that something is not right. There's that odd flicker appearing here
and there.

About the colour: they are usually white, but not always. I swear I saw
colourful ones here and there. Also, when I look at the blue GNOME background,
I don't see any white lines, but there is some sort of flickering.

My guess is that one pixel sort of stretches itself, covering other ones. As if
the rendering lagged and printed the same pixel a couple of times. I think
that's the most accurate description I can give.

Also, this only happens in the built-in display. I have a LCD plugged in right
now, and it's fine.

If you need any more info, just ask.

Thanks.

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