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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [ILK] [sna gen 5] Delayed drawing of strings and characters."
href="https://bugs.freedesktop.org/show_bug.cgi?id=84108">84108</a>
</td>
</tr>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Summary</th>
<td>[ILK] [sna gen 5] Delayed drawing of strings and characters.
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>hamer.mk@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>Driver/intel
</td>
</tr>
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<th>Product</th>
<td>xorg
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=106568" name="attach_106568" title="Restoration of one hunk from fb51ec4">attachment 106568</a> <a href="attachment.cgi?id=106568&action=edit" title="Restoration of one hunk from fb51ec4">[details]</a></span>
Restoration of one hunk from fb51ec4
I have Lenovo ThinkPad X201 tablet with Intel Core i7 L-620 (Intel HD Graphics
gen 5).
Somewhere around version 2.99.912 of xf86-video-intel I got a strange bug: when
I scroll page in browser the refreshing of screen is delayed or when I type
text the symbols appear not after each one but after every second symbol.
I found that problem starts after commit:
commit fb51ec44f4b6069ab854233d5d0da34eb79f754c
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Mon Jun 23 09:07:13 2014 +0100
sna: Rename IGNORE_CPU to IGNORE_DAMAGE to better reflect its purpose
Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
I found that if I restore only one hunk (4th hunk in file
«src/sna/sna_accel.c») from this commit the bug disappears. By this hunk the
one line in «src/sna/sna_accel.c» was changed but not just renamed:
from: (flags & REPLACES || !priv->gpu_damage.....
to: (flags & (REPLACES | IGNORE_DAMAGE) || !priv->gpu_damage.....
But according to <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - Damage tracking problems"
href="show_bug.cgi?id=79993">bug #79993</a> this maybe not a root cause. But I don't know why
my patch works...
Please see video here: <a href="http://youtu.be/JjAScg4MZNk">http://youtu.be/JjAScg4MZNk</a>
On «test 1» and «test 2» I use clean driver from git and symbols printed with
delay.
On «test 3» and «test 4» I use attached patch and symbols printed normally.</pre>
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