Public bug reported:
Hi,
I`m running Ubuntu 8.04 on Atom Z530+Poulsbo based board.
Xorg driver: xserver-xorg-video-psb - 0.16.0+repack-0ubuntu1~804um6
Kernel drm module version: psb - 2.3.0.32L.0029
System works fine, exept abnormal display flickering on high resolutions
(1920x1080). On lower resolutions (1240x1024) flickering exists too but
not so frequently. On playing videos flickering is amplified. Display
connected to SDVO output.
In dmesg output I see "buffer underrun" error, that printed from psb
kernel module:
>From file psb_irq.c:
/*
* Video display controller interrupt.
*/
static int underrun = 0;
static void psb_vdc_interrupt(struct drm_device *dev, uint32_t vdc_stat)
{
struct drm_psb_private *dev_priv =
(struct drm_psb_private *)dev->dev_private;
uint32_t pipestat;
int wake = 0;
pipestat = PSB_RVDC32(PSB_PIPEASTAT);
if (pipestat & (1<<31)) {
printk("psb: buffer underrun 0x%x\n",underrun++);
PSB_WVDC32(1<<31 | 1<<15, PSB_PIPEASTAT);
}
I am not sure if source of the problem is xserver-xorg-video-psb driver
or bug in kernel module... But on Windows XP on same load display works
well.
Another question - in xorg.conf generated with help of xserver-xorg-
video-psb I see many options:
#Option "ShadowFB" # [<bool>]
#Option "NoAccel" # [<bool>]
#Option "SWcursor" # [<bool>]
#Option "ExaMem" # <i>
#Option "ExaScratch" # <i>
#Option "IgnoreACPI" # [<bool>]
#Option "NoPanel" # [<bool>]
#Option "LidTimer" # [<bool>]
#Option "NoFitting" # [<bool>]
#Option "DownScale" # [<bool>]
Where I can find documentation what exactly these options means?
And may be exists other configuration options for this driver that can help
with display flickering??
Thanks, Denis.
** Affects: xserver-xorg-video-psb (Ubuntu)
Importance: Undecided
Status: New
--
dispay flickering on high resolutions
https://bugs.launchpad.net/bugs/348537
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