#5214 closed bug (invalid)
[Intel_extreme] Wrong BPP on Intel GMA 950
| Reported by: | HaikuBot | Owned by: | nobody |
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| Priority: | normal | Milestone: | |
| Component: | Drivers/Graphics/intel_extreme | Version: | R1/Development |
| Keywords: | Cc: | lurohh@… | |
| Blocked By: | #7662 | Blocking: | #4797 |
| Platform: | All |
Description
Greeting.
I found that bug when try set this wallpaper (http://www.artofadambetts.com/images/postgraphics/downloads/desktopbgs/beoriginal-1920.png). On my laptop gradient not smooth as it should be. See photos.
I were try switch to VESA and see what be. In VESA with BPP 32 bits - gradient smooth as it should be. But with BPP 16 bits - gradient displayed exactly as on photos. So I can make conclusion that intel_extreme driver set incorrect BPP.
Attachments (7)
Change History (25)
by , 15 years ago
| Attachment: | 16bits_photo_1.jpg added |
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by , 15 years ago
| Attachment: | 16bits_photo_2.jpg added |
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by , 15 years ago
| Attachment: | 16bits_screen_preflet.png added |
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by , 15 years ago
| Attachment: | listdev.txt added |
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by , 15 years ago
| Attachment: | syslog.txt added |
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comment:1 by , 15 years ago
What is most likely the problem is that you actually have a 16 bpp panel. Graphics chips can be programmed to subtly dither the output by varying the pixel brightness forth and back every other refresh. We found this out last BeGeistert when Rudolf fixed the nvidia driver to turn on this exact feature. What I am guessing is that when you run in VESA mode, the feature is automatically turned on through your VESA-BIOS, while when running with the native intel driver, it is not turned on yet.
follow-up: 5 comment:2 by , 15 years ago
I can't really see much difference between the two images (but I'm using the Intel Extreme driver as well ;-)).
Anyway, this probably just means that your *display* does not support more colors properly. I would assume VESA enables some panel dithering mode that I don't use in the driver.
I haven't seen anything like this in the docs, but I didn't search for this particular thing either, yet.
by , 15 years ago
| Attachment: | VESA_16bits_photo_.jpg added |
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by , 15 years ago
| Attachment: | VESA_32bits_photo_.jpg added |
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comment:3 by , 15 years ago
Attached photos with VESA.
Under Windows, Linux and OpenBSD I never seen anything like this.
comment:4 by , 15 years ago
| Cc: | added |
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comment:5 by , 15 years ago
Replying to axeld:
I haven't seen anything like this in the docs, but I didn't search for this particular thing either, yet.
In which docs? Maybe I can seach for dithering mode in this docs?
comment:6 by , 15 years ago
See http://intellinuxgraphics.org/documentation.html - there are a couple of docs that should cover the chipset in question to a degree.
comment:7 by , 15 years ago
| Blocking: | 4797 added |
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comment:8 by , 15 years ago
Same problem with Intel Mobile 945GME. Unsmooth gradient in glow around HAIKU text in default background on real hardware compared to VirtualBox.
comment:9 by , 15 years ago
Maybe this is the same issue I had with my nvidia 7600go, see #4411, which was fixed by introducing dithering in hrev33653.
I also have a netbook with an i945GME. It shows the same "banding" when displaying a gradient. When taking a screenshot and looking at it on my other computer, the gradient is smooth. Maybe it's the same thing.
comment:11 by , 14 years ago
| Milestone: | R1/alpha3 → R1 |
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This is valid, but the system is useable nonetheless. Removing of alpha3 milestone.
comment:12 by , 13 years ago
| Blocking: | 7662 added |
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comment:13 by , 8 years ago
| Owner: | changed from to |
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| Status: | new → assigned |
comment:14 by , 6 years ago
| Milestone: | R1 → R1/beta2 |
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comment:16 by , 6 years ago
| Blocked By: | 7662 added |
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| Blocking: | 7662 removed |
comment:18 by , 5 years ago
| Milestone: | R1/beta2 |
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Remove milestone for tickets with status = closed and resolution != fixed
Screen preflet screenshot