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I own a Sony Vaio Z laptop equipped with a common intel video card and an external Radeon HD 7000 graphics card (literally external, connected through thunderbolt/lightpeak).
The problem is that whenever I connect the external video card (which by the way works just fine using the opensource ati driver), gnome-shell fails to paint most of my app icons and other possibly related problems appear:
(1) as I said, no icons for some of the apps (see this screenshot); if i restart gnome-shell (using Alt+F2, r) the icons show up but just for the next couple of minutes. Only the icons that are painted by gnome-shell seem to be problematic (these include the dash, the apps list and sometimes the status menu icons). No useful output messages are printed by gnome-shell if running from a terminal. No extensions are enabled at all. This also happens with the default icon set.
(2) gnome-screenshot timeouts after ~20 seconds saying "** Message: Unable to use GNOME Shell's builtin screenshot interface, resorting to fallback X11". ltrace says that a call to g_dbus_connection_call_sync blocks the process.
(3) scrolling in chromium using the mouse is sometimes laggy, but this may be due to issues in the radeon driver.
None of these problems appear when the external card is not connected. I know this may be an upstream bug but I'd like to see first if the Arch community has any idea about this. I am really willing to debug this issue and spend as much time as needed on it, but I don't know where to start from.
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It appears that all the 10 threads of the GTask thread pool are fully occupied most of the time. Therefore all the glib async requests are blocked for a while until the active tasks somehow finish (or timeout). I have no idea though how to find out what are those 10 threads occupied with.
Last edited by ccrisan (2014-03-05 11:49:39)
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