Public bug reported:

Under XP
card detected as
PCI\VEN_10DE&DEV_0221&SUBSYS_00000000&REV_A1\4&3A321F38&0&48F0

PCI\VEN_10DE&DEV_0221&SUBSYS_00000000&REV_A1\4&3A321F38&0&48F0

PCI\VEN_10DE&DEV_0221&SUBSYS_00000000&REV_A1
PCI\VEN_10DE&DEV_0221&CC_030000

memory range 94000000 94FFFFFF
memory range C0000000 DFFFFFFF
memory range 92000000 92FFFFFF
IRQ 09
IO range 03B0 03BB
IO range 03C0 03DF
memory range 000A0000 000BFFFF

Processeur graphique :          GeForce 6200
Version du pilote :     307.83
Prise en charge DirectX :       9.0c
Horloge principale :    300 MHz 
Débit de données mémoire :      1064 MHz
Interface de mémoire :  64 bits 
Mémoire :               256 Mo
Type de mémoire :       DDR2
Version BIOS vidéo :    5.44.A2.10.26
IRQ :                   9
Bus :                   PCI

correctly detected as 256Mb and working


Under linux
file /var/log/Xorg.0.log
contains 18.759] (--) PCI: (0:3:9:0) 10de:0221:0000:0000 rev 161, Mem @ 
0x94000000/16777216, 0xc0000000/536870912, 0x92000000/16777216, BIOS @ 
0x????????/131072
card bad detection ... 0xc0000000/536870912 correct adress, wrong size 
536870912 soit 512Mo

output of:

sudo lshw -C display; lsb_release -a; uname -a

is

jean@jean-Soisy:~$ sudo lshw -C display; lsb_release -a; uname -a
[sudo] password for jean:
  *-display
       description: Display controller
       produit: 82865G Integrated Graphics Controller
       fabriquant: Intel Corporation
       identifiant matériel: 2
       information bus: pci@0000:00:02.0
       version: 02
       bits: 32 bits
       horloge: 33MHz
       fonctionnalités: pm bus_master cap_list rom
       configuration: driver=i915 latency=0
       ressources: irq:16 mémoire:a0000000-a7ffffff mémoire:90000000-9007ffff 
portE/S:1800(taille=8)
  *-display
       description: VGA compatible controller
       produit: NV44A [GeForce 6200]
       fabriquant: NVIDIA Corporation
       identifiant matériel: 9
       information bus: pci@0000:03:09.0
       version: a1
       bits: 32 bits
       horloge: 66MHz
       fonctionnalités: pm vga_controller bus_master cap_list rom
       configuration: driver=nouveau latency=40 maxlatency=1 mingnt=5
       ressources: irq:21 mémoire:94000000-94ffffff mémoire:c0000000-dfffffff 
mémoire:92000000-92ffffff mémoire:e0000000-e001ffff
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 14.04.5 LTS
Release:    14.04
Codename:    trusty
Linux jean-Soisy 3.13.0-135-generic #184-Ubuntu SMP Wed Oct 18 11:56:31 UTC 
2017 i686 i686 i686 GNU/Linux

Attempted to find  where the memory size detection lies in the code, but
was too far in the labyrinth for me.

Regards

Jean COLIN

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1737423

Title:
  With a (cheap) video card in PCI Geforce 6200 (NV44A) with 256Mb video
  memory misdetected as 512 Mb : result was kernel panic in worst case
  and memory crash in best case

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