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Problems with bttv on kernel 2.4.4 and higher & VIA chipset
- To: Linux-IL <linux-il(at-nospam)cs.huji.ac.il>
- Subject: Problems with bttv on kernel 2.4.4 and higher & VIA chipset
- From: Ilya Konstantinov <linux-il(at-nospam)future.galanet.net>
- Date: Sat, 30 Jun 2001 00:05:09 +0300
- Mail-Followup-To: Ilya Konstantinov <linux-il@future.galanet.net>,Linux-IL <linux-il@cs.huji.ac.il>
- Sender: Ilya Konstantinov <future(at-nospam)goblin.sharat.co.il>
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
- User-Agent: Mutt/1.3.15i
Just in case anyone occured problems resizing / changing to full-screen
on their bttv-based TV card since a kernel update lately...
Kernel 2.4.4 and higher attempt to disable optimized CPU-to-PCI
transfers on certain VIA chipsets, suspecting it causes data
corruption. Later, they've found out that the only affected models
could be fixed with a BIOS upgrade.
Anyhow, this "fixups" slows down the PCI bus and makes it too slow to
transfer the TV image in 32bpp.
So, if anyone is having such problems since the 2.4.4 upgrade, comment
the lines from arch/i386/kernel/pci-pc.c relating to pci_fixup_via691
and pci_fixup_via691_2.
(That was my contribution to SITE :)
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