DVD choppy

[Philip Walden]

Terry Snyder wrote:
> On 2/2/07, Philip Walden <pwaldenlinux at pacbell.net> wrote:
>> Dotan Cohen wrote:
>> > On 30/01/07, Philip Walden <pwaldenlinux at pacbell.net> wrote:
>> >> Philip Walden wrote:
>> >> > Dotan Cohen wrote:
>> >> >> On a recent Dell laptop, what would cause DVD playback to be very
>> >> >> choppy?
>> >> > Besides the ATA DMA stuff, you may also want to check whether your
>> >> > MTRR is being set properly by the xorg X server.
>> >> >
>> >> > Mine looks like this:
>> >> >
>> >> > cat /proc/mtrr
>> >> > reg00: base=0x00100000 (   1MB), size= 256MB: write-back, count=1
>> >> > reg01: base=0xfc000000 (4032MB), size=  32MB: write-combining, 
>> count=1
>> >> >
>> >> > You should have at least one "write-combining" entry which means 
>> the
>> >> > graphics card is set properly. Otherwise, performance can drop
>> >> > dramatically.
>> >> Here is a howto:
>> >>
>> >> http://www.faqs.org/docs/Linux-HOWTO/DVD-HOWTO.html#ss6.1
>> >>
>> >
>> > Thanks. I've nothing in /proc/mtrr:
>> >
>> > [root at localhost ~]# ls /proc/mtrr
>> > /proc/mtrr
>>
>> Try:
>>   cat /proc/mtrr
>> reg00: base=0x00100000 (   1MB), size= 256MB: write-back, count=1
>> reg01: base=0xfc000000 (4032MB), size=  32MB: write-combining, count=1
>>
>>
>> >
>> > However, I'm having a hard time starting X, as it's already running!
>> > I've combed the logs in /var/logs but I don't have those lines. When I
>> > kill X with CTRL-ALT-ESC it starts right back up automatically, not
>> > letting me redirect it's output to a file.
>> I found mine using lspci
>>
>> # /sbin/lspci -v
>>   :
>> 01:05.0 VGA compatible controller: nVidia Corporation NV5 [RIVA
>> TNT2/TNT2 Pro] (rev 15) (prog-if 00 [VGA])
>>         Subsystem: ASUSTeK Computer Inc. AGP-V3800 SDRAM
>>         Flags: bus master, 66MHz, medium devsel, latency 40, IRQ 11
>>         Memory at f5000000 (32-bit, non-prefetchable) [size=16M]
>>         Memory at fc000000 (32-bit, prefetchable) [size=32M]
>> <========== use the prefetchable
>>         Capabilities: [60] Power Management version 1
>>         Capabilities: [44] AGP version 2.0
>>
>> I then added this to /etc/rc.local:
>>
>> # set mtrr at least until Xorg 7.1 is added to the distribution
>> echo "base=0xfc000000 size=0x2000000 type=write-combining" >| /proc/mtrr
>>
>>
>> > Just for kicks, here's the output of "lspci -v" as suggested by the
>> > same page:
>>    :
>> > 01:00.0 VGA compatible controller: ATI Technologies Inc Radeon
>> > Mobility X1400 (prog-if 00 [VGA])
>> >        Subsystem: Dell Unknown device 2003
>> >        Flags: bus master, fast devsel, latency 0, IRQ 4
>> >        Memory at d0000000 (32-bit, prefetchable) [size=256M]
>>          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> >        I/O ports at ee00 [size=256]
>> >        Memory at efdf0000 (32-bit, non-prefetchable) [size=64K]
>> >        [virtual] Expansion ROM at efd00000 [disabled] [size=128K]
>> >        Capabilities: [50] Power Management version 2
>> >        Capabilities: [58] Express Legacy Endpoint IRQ 0
>> >        Capabilities: [80] Message Signalled Interrupts: 64bit+
>> > Queue=0/0 Enable-
>> I would guess your's would look like:
>>
>> echo "base=0xd0000000 size=0x10000000 type=write-combining" >| 
>> /proc/mtrr
>>
>> -- 
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>>
> I noticed that you seemed to have a really good answer to this thread,
> but I didn't want to but in to disrupt it.  I am having the same issue
> with my laptop.  Here is my video card info for lspci-v:
>
> 01:00.0 VGA compatible controller: nVidia Corporation GeForce Go 7400
> (rev a1) (prog-if 00 [VGA])
>        Subsystem: Dell Unknown device 01cc
>        Flags: bus master, fast devsel, latency 0, IRQ 16
>        Memory at ed000000 (32-bit, non-prefetchable) [size=16M]
>        Memory at d0000000 (64-bit, prefetchable) [size=256M]
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
prefetchable memory start address  at 0xd0000000 with the size of
0x10000000 (== 256M in hex)
>        Memory at ee000000 (64-bit, non-prefetchable) [size=16M]
>        [virtual] Expansion ROM at ef000000 [disabled] [size=128K]
>        Capabilities: <access denied>
>
>
> How do you calculate or figure out the information you gave in your
> echo line.  If you know please let me know.
echo "base=<address> size=<memory size> type=write-combining" >| /proc/mtrr

in this case

echo "base=0xd0000000 size=0x10000000 type=write-combining" >| /proc/mtrr

>
> Thanks in advance for any help you can provide.
>
You're welcome