I can confirm this. Using hardy amd64 with fglrx 8.6. lscpi does not
detect it correct, too. I have a Sapphire Radeon HD 3650 with 512 MB
GDDR3.
$ cat /var/log/Xorg.0.log | grep VideoRAM
(--) fglrx(0): VideoRAM: 262144 kByte, Type: DDR3
$ lspci -vvnn
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Mobilitiy Radeon
HD 3600 Series [1002:9598] (prog-if 00 [VGA controller])
Subsystem: PC Partner Limited Unknown device [174b:be42]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 16
Region 0: Memory at c0000000 (64-bit, prefetchable) [size=256M]
Region 2: Memory at e0300000 (64-bit, non-prefetchable) [size=64K]
Region 4: I/O ports at 3000 [size=256]
Expansion ROM at e0320000 [disabled] [size=128K]
Capabilities: <access denied>
** Changed in: xorg (Ubuntu)
Sourcepackagename: None => xorg
Status: New => Confirmed
--
xserver detects only 256 of 512 MB video RAM
https://bugs.launchpad.net/bugs/247887
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