Bug 16536 - [G33] X shows no video and displays "underrun on pipe A" error
Summary: [G33] X shows no video and displays "underrun on pipe A" error
Status: RESOLVED DUPLICATE of bug 16169
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: git
Hardware: x86 (IA32) Linux (All)
: medium normal
Assignee: Jesse Barnes
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords: NEEDINFO
Depends on:
Blocks:
 
Reported: 2008-06-26 19:29 UTC by Jonathan Medefind
Modified: 2008-07-08 10:15 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

Attachments
Xorg.0.log (101.88 KB, text/plain)
2008-06-26 19:29 UTC, Jonathan Medefind 		no flags Details
xorg.conf (1.92 KB, text/plain)
2008-06-26 19:31 UTC, Jonathan Medefind 		no flags Details
dmesg (31.75 KB, text/plain)
2008-06-26 19:31 UTC, Jonathan Medefind 		no flags Details
View All

Description Jonathan Medefind 2008-06-26 19:29:09 UTC 
Whenever I try to start X I get no video input on the monitor and X.log shows an error stating "underrun on pipe A"
Comment 1 Jonathan Medefind 2008-06-26 19:29:44 UTC 
Created attachment 17406 [details]
Xorg.0.log
Comment 2 Jonathan Medefind 2008-06-26 19:31:06 UTC 
Created attachment 17407 [details]
xorg.conf
Comment 3 Jonathan Medefind 2008-06-26 19:31:21 UTC 
Created attachment 17408 [details]
dmesg
Comment 4 Gordon Jin 2008-06-27 00:09:33 UTC 
seems similar to bug#16169.
Comment 5 Jesse Barnes 2008-07-01 18:37:38 UTC 
Can you try this?  I'm pretty sure that reprogramming DSPARB is a bad idea on some machines, maybe including yours.

diff --git a/src/i830_driver.c b/src/i830_driver.c
index dff7d51..2e8f5eb 100644
--- a/src/i830_driver.c
+++ b/src/i830_driver.c
@@ -3408,7 +3408,7 @@ I830EnterVT(int scrnIndex, int flags)
    /* Set the DSPARB register.  This disables the outputs, which is about to
     * happen (likely) in xf86SetDesiredModes anyway.
     */
-   i830_set_dsparb(pScrn);
+//   i830_set_dsparb(pScrn);

    /* Tell the BIOS that we're in control of mode setting now. */
    i830_init_bios_control(pScrn);
Comment 6 Jesse Barnes 2008-07-08 10:15:37 UTC 

*** This bug has been marked as a duplicate of bug 16169 ***

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