1087257 - Corruption when scrolling a page, with OMTC (or e10s) & without HWA

Status: VERIFIED FIXED

(Core :: Graphics: Layers, defect)

Description

[Ekanan Ketunuti]

Attachment: screenshot

+++ This bug was initially created as a clone of Bug #1085223 +++

The first bad revision is: mozilla-central changeset fa9c6845338e

Steps:
 - Disable HWA
 - Scrolling a page.

Graphics:
Adapter Description          Mobile Intel(R) 4 Series Express Chipset Family
Adapter Drivers              igdumdx32 igd10umd32
Adapter RAM                  Unknown
ClearType Parameters         Gamma: 2200 Pixel Structure: B ClearType Level: 0 Enhanced Contrast: 50
Device ID                    0x2a42
DirectWrite Enabled          false (6.2.9200.16571)
Driver Date                  10-4-2012
Driver Version               8.15.10.2869
GPU #2 Active                false
GPU Accelerated              Windows 0/1 Basic (OMTC)
Subsys ID                    20e417aa
Vendor ID                    0x8086
WebGL Renderer               Google Inc. -- ANGLE (Mobile Intel(R) 4 Series Express Chipset Family Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote     true
AzureCanvasBackend           skia
AzureContentBackend          cairo
AzureFallbackCanvasBackend   cairo
AzureSkiaAccelerated         0


The bug goes away if switch off OMTC.

Comment 2

[IU]

This bug makes it difficult to effectively use Firefox while in a Remote Desktop (RDP) session, because hardware acceleration is disabled there by default.

Comment 3

[Jared Wein [:jaws] (please needinfo? me)]

Matt/Benoit, can this be fixed today? If not, we should back out bug 1085223 since Nightly is effectively busted for people that can't use HWA.

Comment 5

[Daniel Holbert [:dholbert]]

This bug makes Bugzilla completely unusable, if you have "layers.offmainthreadcomposition.enabled" turned on, or if you're using e10s.

Comment 6

[Daniel Holbert [:dholbert]]

Attachment: screencast (attempting to scroll by dragging scrollbar, & occasionally doing 'select-all' to force a repaint)

Comment 7

[Daniel Holbert [:dholbert]]

Chatted w/ mattwoodrow; he's OK with backing out to fix this, since this breaks the web for people w/ e10s enabled [depending on their hardware], and we've been aggressively pushing Nightly users to enable e10s.

I'll land the backout patch once the tree reopens.

Comment 9

[Daniel Holbert [:dholbert]]

Backed out bug 1085223 (as noted in bug 1085223 comment 9), which should fix this.

Leaving open until that backout-cset is merged to central.

Comment 10

[Ekanan Ketunuti]

https://hg.mozilla.org/mozilla-central/rev/0d2784aa8739

Comment 14

[Ekanan Ketunuti]

verified fixed in 36.0a1 20141023030203.